I have a firewall which has 2 mail server's public smtp and pop ips mapped to internal ips via NAT one-to-one translation on ports 25 and port 110.
Mail Server 1
smtp.abc.com ( 188.8.131.52) map on (port 25) to 192.168.100.5
pop.abc.com ( 184.108.40.206) map on (port 110) to 192.168.100.6
Mail Server 2
smtp.xyz.com ( 220.127.116.11) map on (port 25) to 192.168.100.10
pop.xyz.com ( 18.104.22.168) map on (port 110) to 192.168.100.11
The problem is if I turn both smtp servers on , 1 or the other emails does not work
How how should I map/configure the 2 mail servers or similar ports behind a firewall on the same lan/subnet ?
Whats the right way to do this?